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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Thomas Hellstrom <thellstrom@vmware.com>,
        Deepak Rawat <drawat@vmware.com>
Subject: [PATCH 4.14 62/69] drm/vmwgfx: Dont send drm sysfs hotplug events on initial master set
Date:   Fri,  7 Jun 2019 17:39:43 +0200
Message-Id: <20190607153855.651941146@linuxfoundation.org>
In-Reply-To: <20190607153848.271562617@linuxfoundation.org>
References: <20190607153848.271562617@linuxfoundation.org>
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From: Thomas Hellstrom <thellstrom@vmware.com>

commit 63cb44441826e842b7285575b96db631cc9f2505 upstream.

This may confuse user-space clients like plymouth that opens a drm
file descriptor as a result of a hotplug event and then generates a
new event...

Cc: <stable@vger.kernel.org>
Fixes: 5ea1734827bb ("drm/vmwgfx: Send a hotplug event at master_set")
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -1245,7 +1245,13 @@ static int vmw_master_set(struct drm_dev
 	}
 
 	dev_priv->active_master = vmaster;
-	drm_sysfs_hotplug_event(dev);
+
+	/*
+	 * Inform a new master that the layout may have changed while
+	 * it was gone.
+	 */
+	if (!from_open)
+		drm_sysfs_hotplug_event(dev);
 
 	return 0;
 }